556 



PROCEEDINGS OF THE ACADEMY OF 



[Oct., 



depressed, free and rounded in front. Mandible robust, convex, 

 strong, rami not elevated in mouth, and upper jaw moderately 

 protruded beyond when mouth closes. Nostrils together, large, 

 close before eye above, anterior simple pore and posterior crescent ic. 

 Interorbital broadly convex. Preorbital narrow. Infraorbital 

 broad, smooth, completely covers cheek. Hind preopercle edge 

 vertical. Opercle deep, smooth, hind edge above slightly emarginate. 

 Broad fontanel from between frontals and parietals to occipital 

 process, latter short and triangular. 



Gill-opening extends forward about opposite first | in eye. Rakers 

 about 5+9, slender, lanceolate, much less than filaments, and 



Fig. 17. — Bryconamericus jacimda Fowler. (Tj'pe.) 



latter about | of eye. Isthmus constricted, surface convex. Branchi- 

 ostegals large, subequal. 



Scales moderate, moderately imbricated, disposed in longitudinal 

 series parallel with 1. 1., those on middle of side little larger than 

 others. Caudal with greater portion basally covered with small 

 close-set scales. Anal with bSsal series of scales its whole extent, 

 though graduated smaller posteriorly. Ventral with free pointed 

 axillary scaly flap about I length of fin. L. 1. complete, decurved 

 till about f in greatest body depth, and extends a little low along 

 caudal peduncle side till midway at caudal base. Tubes simple, 

 and each one extends anteriorly on scale exposure about f its extent. 



Dorsal origin about midway between front eye edge and caudal 



